feat(go): generate unique load simulator frames

go/vehicle-gateway/internal/loadsim/mutator_test.go

@@ -0,0 +1,106 @@
+package loadsim
+
+import (
+	"testing"
+
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/protocol/gb32960"
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/protocol/jt808"
+)
+
+func TestFrameFactoryGeneratesUniqueParsableJT808Frames(t *testing.T) {
+	factory, err := NewFrameFactory(ProtocolJT808, "0200")
+	if err != nil {
+		t.Fatalf("NewFrameFactory() error = %v", err)
+	}
+
+	first, err := factory.Frame(0, 0)
+	if err != nil {
+		t.Fatalf("first Frame() error = %v", err)
+	}
+	second, err := factory.Frame(1, 2)
+	if err != nil {
+		t.Fatalf("second Frame() error = %v", err)
+	}
+	if string(first) == string(second) {
+		t.Fatal("variant frames should not be byte-identical")
+	}
+
+	firstEnv := parseJT808Frame(t, first)
+	secondEnv := parseJT808Frame(t, second)
+	if firstEnv.Phone == secondEnv.Phone {
+		t.Fatalf("phones should differ, both %q", firstEnv.Phone)
+	}
+	if firstEnv.Sequence == secondEnv.Sequence {
+		t.Fatalf("sequences should differ, both %d", firstEnv.Sequence)
+	}
+	if firstEnv.StableEventID() == secondEnv.StableEventID() {
+		t.Fatal("stable event ids should differ")
+	}
+}
+
+func TestFrameFactoryGeneratesUniqueParsableGB32960Frames(t *testing.T) {
+	factory, err := NewFrameFactory(ProtocolGB32960, "realtime")
+	if err != nil {
+		t.Fatalf("NewFrameFactory() error = %v", err)
+	}
+
+	first, err := factory.Frame(0, 0)
+	if err != nil {
+		t.Fatalf("first Frame() error = %v", err)
+	}
+	second, err := factory.Frame(1, 2)
+	if err != nil {
+		t.Fatalf("second Frame() error = %v", err)
+	}
+	if string(first) == string(second) {
+		t.Fatal("variant frames should not be byte-identical")
+	}
+
+	firstEnv := parseGB32960Frame(t, first)
+	secondEnv := parseGB32960Frame(t, second)
+	if firstEnv.VIN == secondEnv.VIN {
+		t.Fatalf("VINs should differ, both %q", firstEnv.VIN)
+	}
+	if firstEnv.StableEventID() == secondEnv.StableEventID() {
+		t.Fatal("stable event ids should differ")
+	}
+}
+
+func parseJT808Frame(t *testing.T, frame []byte) parsedEnvelope {
+	t.Helper()
+	frames, remainder, err := jt808.ExtractFrames(frame)
+	if err != nil {
+		t.Fatalf("ExtractFrames() error = %v", err)
+	}
+	if len(remainder) != 0 || len(frames) != 1 {
+		t.Fatalf("unexpected split frames=%d remainder=%x", len(frames), remainder)
+	}
+	env, err := jt808.ParseFrame(frames[0], 1782918600000, "127.0.0.1:808")
+	if err != nil {
+		t.Fatalf("ParseFrame() error = %v", err)
+	}
+	return parsedEnvelope{Phone: env.Phone, VIN: env.VIN, Sequence: env.Sequence, StableEventID: env.StableEventID}
+}
+
+func parseGB32960Frame(t *testing.T, frame []byte) parsedEnvelope {
+	t.Helper()
+	frames, remainder, err := gb32960.ExtractFrames(frame)
+	if err != nil {
+		t.Fatalf("ExtractFrames() error = %v", err)
+	}
+	if len(remainder) != 0 || len(frames) != 1 {
+		t.Fatalf("unexpected split frames=%d remainder=%x", len(frames), remainder)
+	}
+	env, err := gb32960.ParseFrame(frames[0], 1782918600000, "127.0.0.1:32960")
+	if err != nil {
+		t.Fatalf("ParseFrame() error = %v", err)
+	}
+	return parsedEnvelope{Phone: env.Phone, VIN: env.VIN, Sequence: env.Sequence, StableEventID: env.StableEventID}
+}
+
+type parsedEnvelope struct {
+	Phone         string
+	VIN           string
+	Sequence      uint16
+	StableEventID func() string
+}